Looks like most everyone directed you to food books (I know you specifically asked about diet) but I found this book to be of great understanding to me when I was first diagnosed:
100 Questions & Answers about Crohn's Disease and Ulcerative Colitis: A Lahey Clinic Guide.
I got mine for free on the CCFA web site (don't know if they are still doing that or not...I know you can buy it).
Diagnosed in October, 2004 at age 32
(misdiagnosed with IBS in 2002)
Current Rx's: Colazal (generic), Omeprazole (PRN), Librax, One-A-Day multivitamin, Probiotic, Omega-3 Fish Oil, Vitamin D, Cranberry pills; Slow Fe (PRN)
Secondary conditions: swelling ankles, extreme fatigue, mouth ulcers, joint pain
Previous/occasional Rx's: Prednisone, Flagyl, Levaquin, Xifaxan, Carafate
4/7/09: Gall bladder removal laproscopic surgery (gall stones)